It's very common for the pressure to drop, in fact it's unusual that one will hold pressure, and it really doesn't prove anything if it does or doesn't.
Just FYI, I would never put that much pressure on one, especially if it had some years on the radiator, but it's done, and you got away with it...
But what I would look for is coolant in the oil by cracking the oil drain plug and see if anything drips out.
Then remove the spark plugs. Look at the ends of the plugs for evidence of water, and spin the engine through, see if any vapor blows out.
Typically if there is coolant getting in the crankcase it will show up as water condensing under the valve cover, underside of the oil cap, inside the dip stick tube, and coming out the cc vent tube or PCV system if equipped. If there is coolant getting into a cylinder, it will have mystery coolant loss, overheating, abnormal steam out the exhaust, misfire, even liquid locked cylinder as it progresses.
There can also be collection of moisture from the outside, not related to the cooling system if the engine has been operated intermittently, not brought up to operating temperature, or operated with no thermostat or a failed open thermostat. A clogged crank case vent system will contribute too.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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